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Iron-modified bentonite activated urea peroxide degrades trichloroethylene |
MA Li-juan, LINGHU Shan-shan, PAN Tao, ZHAO Tao, LIU Bang-guo, CHEN Xiu-rong |
School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China |
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Abstract Iron modified bentonite (FBT) was synthesized impregnation method and FBT activated urea peroxide (UHP) to degrade trichloroethylene (TCE). The optimal application method and mass ratio of FBT and UHP were optimized, and the effect of temperature on the degradation effect was analyzed. The FBT was characterized by XPS, FTIR, SEM and TEM. The main active substances were identified using electron paramagnetic resonance. Combined with the identification of intermediates by GC-MS, the possible reaction path was speculated. According to the results, TCE degradation was best when dried FBT particles were mixed with saturated urea peroxide solution. The optimal mass ratio for FBT and UHP is 1:1. After 24 hours, the residual percentage of TCE in the FBT/UHP system was about 7.4%, which was nearly 40% lower than in the BT/UHP system. As the main active substance, hydroxyl radical (·OH) contributed 88.6% to TCE degradation. Three intermediate products were identified:CH2Cl2, NH2CHO, (NH2)2CO, and one final product of oxidation, CO2.
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Received: 11 October 2022
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